Physiology 3120 Lecture Notes - Stroke Volume, Afterload, Parasympathetic Nervous System

33 views2 pages

Document Summary

Mechanical performance of the heart: factors controlling cardiac output. Preload: amount of blood in ventricle before it contracts. Frank-starling curve: a (control, b (with sympathetic stimulation); at a given edv, stroke volume increases with, c (with parasympathetic stimulation); at a given edv, stroke volume decreases sympathetic stimulation with parasympathetic stimulation. The force against which the heart has to pump is the afterload; pressure in aorta is the afterload faced by the lv; pressure in pulmonary artery is the afterload faced by the rv. If the afterload becomes very high (as in severe hypertension), then the heart fails. Cardiac output = oxygen consumption/[ao2] [vo2] (rearranged formula) Inject known about of dye into right atrium/vena cava goes first to pulmonary circulation, then to systemic. Measure the concentration of dye in the blood. Cardiac output = amount of dye injected / (mean concentration in arteries * duration of first circulation) Stop dividing during early postnatal life; rather, grow by hypertrophy (cells get bigger)

Get access

Grade+20% off
$8 USD/m$10 USD/m
Billed $96 USD annually
Grade+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
40 Verified Answers
Class+
$8 USD/m
Billed $96 USD annually
Class+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
30 Verified Answers

Related Documents

Related Questions